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Re: transmission quit moving no noise, nothing grinding...
If it doesn't move forward or backward, then the pump or torque converter are likely bad. First put it in drive with the rear wheels up. Pull out the speed sensor in the overdrive unit( rear housing on the trans) and look in the hole to see if the output shaft is turning. This will tell you if this is a trans problem or a transfer case problem. If it is turning but the rear drive shaft isn't, inspect the transfer case. If the output shaft isn't turning, hook up a pressure gauge to the transmission and check for line pressure. If line pressure is low, replace the pump. If line pressure is good, replace the torque converter.
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First eliminate the fuel flow, replace the fuel filter. It starts and runs, pump is OK. Then I would go back to the exhaust. Remove an O2 sensor before the catalytic converter. One is fine. It will be louder. If it runs better at picks up speed, then the cats are clogging up.
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Computer controlled transmissions can get confused at times, from my personal experience. If the problem doesn't happen again, I would ignore it. If it happens all the time, it's most likely the transmission computer. Other things could be the shift linkage, engine vacuum leak, speed sensor, etc... Hope this helps.
What is your Transmission Fluid Level? If Low, it could cause this signal.
When was the Transmission Fluid and Filter last changed? Was the correct fluid used?
I would have these changed as soon as possible.
There is a Transmission Temperature Sensor on 4-speed transmissions.. Check the Connection and Voltage on this Sensor.
Remove this sensor, clean, reinstall, and check to see if the light comes back on. If it does, remove and replace this sensor.
Check fluid level in transmission. If full, drop pan and check that filter is not plugged. If both are fine, have a trans shop take a look at it. Internal transmission work although not impossible to do, is generally best left for the people that do it for a living. Even most skilled automotive techs opt to have their units done elsewhere, even if they remove it themselves. I know that you'd rather that I tell you that it's something easy but it's just not.